/**
 * #      865
 * 名称   具有所有最深节点的最小子树
 * 链接   https://leetcode-cn.com/problems/smallest-subtree-with-all-the-deepest-nodes
 * 题解   [90](https://leetcode-cn.com/problems/smallest-subtree-with-all-the-deepest-nodes/solution)
 * 通过率 63.4%
 * 难道   中等
 */

